We consider the decay with the at rest. (a) We have to calculate the disintegration energy; (b) find the kinetic energy of the proton; and (c) the kinetic energy of the pion.

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We recall that the needed rest mass energies are

(a)

The disintegration energy of the decay will therefore be

(b)

From the preceding problem that is 910 we recall that the kinetic energy of the proton in terms of the rest mass energies of , p and is given by the expression

Therefore, the kinetic energy of the proton will be